From: Dave Chinner <dchinner@xxxxxxxxxx>
Embedding a switch statement in every btree stats inc/add adds a lot
of code overhead to the core btree infrastructure paths. Stats are
supposed to be small and lightweight, but the btree stats have
become big and bloated as we've added more btrees. It needs fixing
because the reflink code will just add more overhead again.
Convert the v2 btree stats to arrays instead of independent
variables, and instead use the type to index the specific btree
array via an enum. This allows us to use array based indexing
to update the stats, rather than having to derefence variables
specific to the btree type.
If we then wrap the xfsstats structure in a union and place uint32_t
array beside it, and calculate the correct btree stats array base
array index when creating a btree cursor, we can easily access
entries in the stats structure without having to switch names based
on the btree type.
We then replace with the switch statement with a simple set of stats
wrapper macros, resulting in a significant simplification of the
btree stats code, and:
text data bss dec hex filename
46485 144 8 46637 b62d fs/xfs/libxfs/xfs_btree.o.old
35957 144 8 36109 8d0d fs/xfs/libxfs/xfs_btree.o
it reduces the core btree infrastructure code size by close to 25%!
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_alloc_btree.c | 4 +
fs/xfs/libxfs/xfs_bmap_btree.c | 1 +
fs/xfs/libxfs/xfs_btree.h | 40 +--------
fs/xfs/libxfs/xfs_ialloc_btree.c | 2 +
fs/xfs/libxfs/xfs_rmap_btree.c | 1 +
fs/xfs/xfs_stats.c | 10 +--
fs/xfs/xfs_stats.h | 174 ++++++++++++++++-----------------------
7 files changed, 88 insertions(+), 144 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_alloc_btree.c b/fs/xfs/libxfs/xfs_alloc_btree.c
index 5ba2dac..44cfcd0 100644
--- a/fs/xfs/libxfs/xfs_alloc_btree.c
+++ b/fs/xfs/libxfs/xfs_alloc_btree.c
@@ -428,6 +428,10 @@ xfs_allocbt_init_cursor(
cur->bc_btnum = btnum;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_ops = &xfs_allocbt_ops;
+ if (btnum == XFS_BTNUM_BNO)
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtb_2);
+ else
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtc_2);
if (btnum == XFS_BTNUM_CNT) {
cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index cd85274..5c32e65 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -785,6 +785,7 @@ xfs_bmbt_init_cursor(
cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
cur->bc_btnum = XFS_BTNUM_BMAP;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_bmbt_2);
cur->bc_ops = &xfs_bmbt_ops;
cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 04d0865..c464cb3 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -105,43 +105,10 @@ union xfs_btree_rec {
/*
* Generic stats interface
*/
-#define __XFS_BTREE_STATS_INC(mp, type, stat) \
- XFS_STATS_INC(mp, xs_ ## type ## _2_ ## stat)
#define XFS_BTREE_STATS_INC(cur, stat) \
-do { \
- struct xfs_mount *__mp = cur->bc_mp; \
- switch (cur->bc_btnum) { \
- case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(__mp, abtb, stat); break; \
- case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(__mp, abtc, stat); break; \
- case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(__mp, bmbt, stat); break; \
- case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(__mp, ibt, stat); break; \
- case XFS_BTNUM_FINO: __XFS_BTREE_STATS_INC(__mp, fibt, stat); break; \
- case XFS_BTNUM_RMAP: __XFS_BTREE_STATS_INC(__mp, rmap, stat); break; \
- case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
- } \
-} while (0)
-
-#define __XFS_BTREE_STATS_ADD(mp, type, stat, val) \
- XFS_STATS_ADD(mp, xs_ ## type ## _2_ ## stat, val)
-#define XFS_BTREE_STATS_ADD(cur, stat, val) \
-do { \
- struct xfs_mount *__mp = cur->bc_mp; \
- switch (cur->bc_btnum) { \
- case XFS_BTNUM_BNO: \
- __XFS_BTREE_STATS_ADD(__mp, abtb, stat, val); break; \
- case XFS_BTNUM_CNT: \
- __XFS_BTREE_STATS_ADD(__mp, abtc, stat, val); break; \
- case XFS_BTNUM_BMAP: \
- __XFS_BTREE_STATS_ADD(__mp, bmbt, stat, val); break; \
- case XFS_BTNUM_INO: \
- __XFS_BTREE_STATS_ADD(__mp, ibt, stat, val); break; \
- case XFS_BTNUM_FINO: \
- __XFS_BTREE_STATS_ADD(__mp, fibt, stat, val); break; \
- case XFS_BTNUM_RMAP: \
- __XFS_BTREE_STATS_ADD(__mp, rmap, stat, val); break; \
- case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \
- } \
-} while (0)
+ XFS_STATS_INC_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat)
+#define XFS_BTREE_STATS_ADD(cur, stat, val) \
+ XFS_STATS_ADD_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat, val)
#define XFS_BTREE_MAXLEVELS 9 /* max of all btrees */
@@ -250,6 +217,7 @@ typedef struct xfs_btree_cur
__uint8_t bc_nlevels; /* number of levels in the tree */
__uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */
xfs_btnum_t bc_btnum; /* identifies which btree type */
+ int bc_statoff; /* offset of btre stats array */
union {
struct { /* needed for BNO, CNT, INO */
struct xfs_buf *agbp; /* agf/agi buffer pointer */
diff --git a/fs/xfs/libxfs/xfs_ialloc_btree.c b/fs/xfs/libxfs/xfs_ialloc_btree.c
index 31ca220..f93c288 100644
--- a/fs/xfs/libxfs/xfs_ialloc_btree.c
+++ b/fs/xfs/libxfs/xfs_ialloc_btree.c
@@ -365,9 +365,11 @@ xfs_inobt_init_cursor(
if (btnum == XFS_BTNUM_INO) {
cur->bc_nlevels = be32_to_cpu(agi->agi_level);
cur->bc_ops = &xfs_inobt_ops;
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_ibt_2);
} else {
cur->bc_nlevels = be32_to_cpu(agi->agi_free_level);
cur->bc_ops = &xfs_finobt_ops;
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_fibt_2);
}
cur->bc_blocklog = mp->m_sb.sb_blocklog;
diff --git a/fs/xfs/libxfs/xfs_rmap_btree.c b/fs/xfs/libxfs/xfs_rmap_btree.c
index 17b8eeb..a749d3b 100644
--- a/fs/xfs/libxfs/xfs_rmap_btree.c
+++ b/fs/xfs/libxfs/xfs_rmap_btree.c
@@ -483,6 +483,7 @@ xfs_rmapbt_init_cursor(
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_ops = &xfs_rmapbt_ops;
cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]);
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2);
cur->bc_private.a.agbp = agbp;
cur->bc_private.a.agno = agno;
diff --git a/fs/xfs/xfs_stats.c b/fs/xfs/xfs_stats.c
index 6e812fe0..6e021a7 100644
--- a/fs/xfs/xfs_stats.c
+++ b/fs/xfs/xfs_stats.c
@@ -79,9 +79,9 @@ int xfs_stats_format(struct xfsstats __percpu *stats, char *buf)
}
/* extra precision counters */
for_each_possible_cpu(i) {
- xs_xstrat_bytes += per_cpu_ptr(stats, i)->xs_xstrat_bytes;
- xs_write_bytes += per_cpu_ptr(stats, i)->xs_write_bytes;
- xs_read_bytes += per_cpu_ptr(stats, i)->xs_read_bytes;
+ xs_xstrat_bytes += per_cpu_ptr(stats, i)->s.xs_xstrat_bytes;
+ xs_write_bytes += per_cpu_ptr(stats, i)->s.xs_write_bytes;
+ xs_read_bytes += per_cpu_ptr(stats, i)->s.xs_read_bytes;
}
len += snprintf(buf + len, PATH_MAX-len, "xpc %Lu %Lu %Lu\n",
@@ -105,9 +105,9 @@ void xfs_stats_clearall(struct xfsstats __percpu *stats)
for_each_possible_cpu(c) {
preempt_disable();
/* save vn_active, it's a universal truth! */
- vn_active = per_cpu_ptr(stats, c)->vn_active;
+ vn_active = per_cpu_ptr(stats, c)->s.vn_active;
memset(per_cpu_ptr(stats, c), 0, sizeof(*stats));
- per_cpu_ptr(stats, c)->vn_active = vn_active;
+ per_cpu_ptr(stats, c)->s.vn_active = vn_active;
preempt_enable();
}
}
diff --git a/fs/xfs/xfs_stats.h b/fs/xfs/xfs_stats.h
index 657865f..7a57c01 100644
--- a/fs/xfs/xfs_stats.h
+++ b/fs/xfs/xfs_stats.h
@@ -21,10 +21,30 @@
#include <linux/percpu.h>
+enum {
+ __XBTS_lookup = 0,
+ __XBTS_compare = 1,
+ __XBTS_insrec = 2,
+ __XBTS_delrec = 3,
+ __XBTS_newroot = 4,
+ __XBTS_killroot = 5,
+ __XBTS_increment = 6,
+ __XBTS_decrement = 7,
+ __XBTS_lshift = 8,
+ __XBTS_rshift = 9,
+ __XBTS_split = 10,
+ __XBTS_join = 11,
+ __XBTS_alloc = 12,
+ __XBTS_free = 13,
+ __XBTS_moves = 14,
+
+ __XBTS_MAX = 15,
+};
+
/*
* XFS global statistics
*/
-struct xfsstats {
+struct __xfsstats {
# define XFSSTAT_END_EXTENT_ALLOC 4
__uint32_t xs_allocx;
__uint32_t xs_allocb;
@@ -117,102 +137,18 @@ struct xfsstats {
__uint32_t xb_page_found;
__uint32_t xb_get_read;
/* Version 2 btree counters */
-#define XFSSTAT_END_ABTB_V2 (XFSSTAT_END_BUF+15)
- __uint32_t xs_abtb_2_lookup;
- __uint32_t xs_abtb_2_compare;
- __uint32_t xs_abtb_2_insrec;
- __uint32_t xs_abtb_2_delrec;
- __uint32_t xs_abtb_2_newroot;
- __uint32_t xs_abtb_2_killroot;
- __uint32_t xs_abtb_2_increment;
- __uint32_t xs_abtb_2_decrement;
- __uint32_t xs_abtb_2_lshift;
- __uint32_t xs_abtb_2_rshift;
- __uint32_t xs_abtb_2_split;
- __uint32_t xs_abtb_2_join;
- __uint32_t xs_abtb_2_alloc;
- __uint32_t xs_abtb_2_free;
- __uint32_t xs_abtb_2_moves;
-#define XFSSTAT_END_ABTC_V2 (XFSSTAT_END_ABTB_V2+15)
- __uint32_t xs_abtc_2_lookup;
- __uint32_t xs_abtc_2_compare;
- __uint32_t xs_abtc_2_insrec;
- __uint32_t xs_abtc_2_delrec;
- __uint32_t xs_abtc_2_newroot;
- __uint32_t xs_abtc_2_killroot;
- __uint32_t xs_abtc_2_increment;
- __uint32_t xs_abtc_2_decrement;
- __uint32_t xs_abtc_2_lshift;
- __uint32_t xs_abtc_2_rshift;
- __uint32_t xs_abtc_2_split;
- __uint32_t xs_abtc_2_join;
- __uint32_t xs_abtc_2_alloc;
- __uint32_t xs_abtc_2_free;
- __uint32_t xs_abtc_2_moves;
-#define XFSSTAT_END_BMBT_V2 (XFSSTAT_END_ABTC_V2+15)
- __uint32_t xs_bmbt_2_lookup;
- __uint32_t xs_bmbt_2_compare;
- __uint32_t xs_bmbt_2_insrec;
- __uint32_t xs_bmbt_2_delrec;
- __uint32_t xs_bmbt_2_newroot;
- __uint32_t xs_bmbt_2_killroot;
- __uint32_t xs_bmbt_2_increment;
- __uint32_t xs_bmbt_2_decrement;
- __uint32_t xs_bmbt_2_lshift;
- __uint32_t xs_bmbt_2_rshift;
- __uint32_t xs_bmbt_2_split;
- __uint32_t xs_bmbt_2_join;
- __uint32_t xs_bmbt_2_alloc;
- __uint32_t xs_bmbt_2_free;
- __uint32_t xs_bmbt_2_moves;
-#define XFSSTAT_END_IBT_V2 (XFSSTAT_END_BMBT_V2+15)
- __uint32_t xs_ibt_2_lookup;
- __uint32_t xs_ibt_2_compare;
- __uint32_t xs_ibt_2_insrec;
- __uint32_t xs_ibt_2_delrec;
- __uint32_t xs_ibt_2_newroot;
- __uint32_t xs_ibt_2_killroot;
- __uint32_t xs_ibt_2_increment;
- __uint32_t xs_ibt_2_decrement;
- __uint32_t xs_ibt_2_lshift;
- __uint32_t xs_ibt_2_rshift;
- __uint32_t xs_ibt_2_split;
- __uint32_t xs_ibt_2_join;
- __uint32_t xs_ibt_2_alloc;
- __uint32_t xs_ibt_2_free;
- __uint32_t xs_ibt_2_moves;
-#define XFSSTAT_END_FIBT_V2 (XFSSTAT_END_IBT_V2+15)
- __uint32_t xs_fibt_2_lookup;
- __uint32_t xs_fibt_2_compare;
- __uint32_t xs_fibt_2_insrec;
- __uint32_t xs_fibt_2_delrec;
- __uint32_t xs_fibt_2_newroot;
- __uint32_t xs_fibt_2_killroot;
- __uint32_t xs_fibt_2_increment;
- __uint32_t xs_fibt_2_decrement;
- __uint32_t xs_fibt_2_lshift;
- __uint32_t xs_fibt_2_rshift;
- __uint32_t xs_fibt_2_split;
- __uint32_t xs_fibt_2_join;
- __uint32_t xs_fibt_2_alloc;
- __uint32_t xs_fibt_2_free;
- __uint32_t xs_fibt_2_moves;
-#define XFSSTAT_END_RMAP_V2 (XFSSTAT_END_FIBT_V2+15)
- __uint32_t xs_rmap_2_lookup;
- __uint32_t xs_rmap_2_compare;
- __uint32_t xs_rmap_2_insrec;
- __uint32_t xs_rmap_2_delrec;
- __uint32_t xs_rmap_2_newroot;
- __uint32_t xs_rmap_2_killroot;
- __uint32_t xs_rmap_2_increment;
- __uint32_t xs_rmap_2_decrement;
- __uint32_t xs_rmap_2_lshift;
- __uint32_t xs_rmap_2_rshift;
- __uint32_t xs_rmap_2_split;
- __uint32_t xs_rmap_2_join;
- __uint32_t xs_rmap_2_alloc;
- __uint32_t xs_rmap_2_free;
- __uint32_t xs_rmap_2_moves;
+#define XFSSTAT_END_ABTB_V2 (XFSSTAT_END_BUF+__XBTS_MAX)
+ __uint32_t xs_abtb_2[__XBTS_MAX];
+#define XFSSTAT_END_ABTC_V2 (XFSSTAT_END_ABTB_V2+__XBTS_MAX)
+ __uint32_t xs_abtc_2[__XBTS_MAX];
+#define XFSSTAT_END_BMBT_V2 (XFSSTAT_END_ABTC_V2+__XBTS_MAX)
+ __uint32_t xs_bmbt_2[__XBTS_MAX];
+#define XFSSTAT_END_IBT_V2 (XFSSTAT_END_BMBT_V2+__XBTS_MAX)
+ __uint32_t xs_ibt_2[__XBTS_MAX];
+#define XFSSTAT_END_FIBT_V2 (XFSSTAT_END_IBT_V2+__XBTS_MAX)
+ __uint32_t xs_fibt_2[__XBTS_MAX];
+#define XFSSTAT_END_RMAP_V2 (XFSSTAT_END_FIBT_V2+__XBTS_MAX)
+ __uint32_t xs_rmap_2[__XBTS_MAX];
#define XFSSTAT_END_XQMSTAT (XFSSTAT_END_RMAP_V2+6)
__uint32_t xs_qm_dqreclaims;
__uint32_t xs_qm_dqreclaim_misses;
@@ -229,26 +165,58 @@ struct xfsstats {
__uint64_t xs_read_bytes;
};
+struct xfsstats {
+ union {
+ struct __xfsstats s;
+ uint32_t a[XFSSTAT_END_XQMSTAT];
+ };
+};
+
+/*
+ * simple wrapper for getting the array index of s struct member offset
+ */
+#define XFS_STATS_CALC_INDEX(member) \
+ (offsetof(struct __xfsstats, member) / (int)sizeof(__uint32_t))
+
+
int xfs_stats_format(struct xfsstats __percpu *stats, char *buf);
void xfs_stats_clearall(struct xfsstats __percpu *stats);
extern struct xstats xfsstats;
#define XFS_STATS_INC(mp, v) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v++; \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v++; \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v++; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v++; \
} while (0)
#define XFS_STATS_DEC(mp, v) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v--; \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v--; \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v--; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v--; \
} while (0)
#define XFS_STATS_ADD(mp, v, inc) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v += (inc); \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v += (inc); \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v += (inc); \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v += (inc); \
+} while (0)
+
+#define XFS_STATS_INC_OFF(mp, off) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off]++; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off]++; \
+} while (0)
+
+#define XFS_STATS_DEC_OFF(mp, off) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off]; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off]; \
+} while (0)
+
+#define XFS_STATS_ADD_OFF(mp, off, inc) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off] += (inc); \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off] += (inc); \
} while (0)
#if defined(CONFIG_PROC_FS)
--
2.8.0.rc3
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